Bosch GSB 21-2 Professional Notice Originale page 23

Mounting the Drill Chuck (see figure F)
The keyless chuck/key type drill chuck is mount-
ed in reverse order.
Remove the steel pin from the drill hole on
the spindle neck after mounting is complet-
ed.
The drill chuck must be tightened with
a tightening torque of approx.
40–45 Nm.
Dust/Chip Extraction
Dusts from materials such as lead-containing
coatings, some wood types, minerals and
metal can be harmful to one's health. Touch-
ing or breathing-in the dusts can cause aller-
gic reactions and/or lead to respiratory infec-
tions of the user or bystanders.
Certain dusts, such as oak or beech dust, are
considered as carcinogenic, especially in
connection with wood-treatment additives
(chromate, wood preservative). Materials
containing asbestos may only be worked by
specialists.
– Provide for good ventilation of the work-
ing place.
– It is recommended to wear a P2 filter-
class respirator.
Observe the relevant regulations in your
country for the materials to be worked.
Operation
Starting Operation
Observe correct mains voltage! The voltage
of the power source must agree with the
voltage specified on the nameplate of the
machine. Power tools marked with 230 V
can also be operated with 220 V.
Reversing the Rotational Direction
(see figures G–H)
Actuate the rotational direction switch 5
only when the machine is at a standstill.
Bosch Power Tools
The rotational direction switch 5 is used to re-
verse the rotational direction of the machine.
However, this is not possible with the On/Off
switch 8 actuated.
Right rotation: For drilling and driving in
screws, push the rotational direction switch 5
downward on the left side and at the same time
upward on the right side.
Left rotation: For loosening and unscrewing
screws and nuts, push the rotational direction
switch 5 upward on the left side and at the same
time downward on the right side.
Setting the Operating Mode
Drilling and Screwdriving
Set the selector switch 2 to the
"Drilling" symbol.
Impact Drilling
Set the selector switch 2 to the "Im-
pact drilling" symbol.
The selector switch 2 engages no-
ticeably and can also be actuated with the ma-
chine running.
Gear Selection, Mechanical
The gear selector 10 can be actuated on ma-
chines running at low speed. However, this
should not be done when the machine is
stopped, at full load or running at maximum
speed.
Two speed ranges can be preselected with the
gear selector 10.
Gear I:
Low speed range; for working with
large drilling diameter or for driv-
ing in screws.
Gear II:
High speed range; for working with
small drilling diameter.
If the gear selector 10 cannot be fully engaged,
lightly rotate the drive spindle with the drill bit
by twisting the drill chuck.
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